Chapter 19 - Metabolism

Question 1

What is the definition for 1 calorie?

Answer 1

The amount of heat required to raise the temperature of one cubic centimeter of water from 14.5 to 15.5 Celsius

Question 2

What are 2 ways to measure the body’s metabolic rate?

Answer 2

1. Amount of heat generated by the body
2. Oxygen consumed by the boyd per minute

Question 3

What is the “basal metabolic rate (BMR)” and what factors determine a persons BMR?

Answer 3

1. The metabolic rate (measure by rate of oxygen consumption) of an awak, relaxed person 12 to 14 hours after a meal and ata. comfortable temperature
2. Determined primarily by person’s age, sec, and body surface. Strongly influenced by level of Thyroid hormone secretion

Question 4

What is the formula for the Respiratory Quotient (RQ)?

Answer 4

VCO2 produced/ VO2 consumed

Question 5

What is the Respiratory Exchange Ratio?

Answer 5

• It is another method to determine metabolic rate by measuring gases at the mouth instead of the partial pressures from the blood.

Question 6

• If the RQ rises above 1.0 can you use it in predicitng the % of fuel consumed (either CHO or fats?)
• Why?

Answer 6

• No.
• Body would become acidotic - CNS tries to fix it thorugh hyperventilation
  
  • Your CO2 levels would be artifically high…throwing off you RQ number.
  • Same thing happens when buffering…CO2 levels are artifically increased throwing off the RQ number.

Question 7

Fill in the blank -

Direct calorimetry measures [] produced

Indirect calorimetry measures [] consumed

Answer 7

1. Heat
2. O2

Question 8

Is our metabolic rate dependent more upon body weight or body size?

Answer 8

• Body Size

Question 9

What is the absolute low of body fat % for males and females?

Answer 9

• Males - 3%
• Female - 12%

Question 11

What has the higher metabolic rate - exercising muscle or liver?

Answer 11

• Exercising muscle
• However, the liver does have a high metabolic rate. It is higher than resting muscle.

Question 12

Does CCK levels fall or rise during/after a meal?

Answer 12

• CCK levels rise during and oimmediately after a meal and suppresses hunger (promotes satiety.

Question 13

What is the metabolic lipophatic theory?

Answer 13

Increase in adipose tissue = > Increase release of leptin ==> decreases apetite

Question 14

What happens to diastolic pressure during exercise?

Answer 14

It should remain unchanged or even go down.